Question

which is a strength - training activity?
○ sit - ups
○ tennis
○ hopscotch
○ jump roping

Explanation:

Strength - training activities focus on building muscle strength. Sit - ups target abdominal muscles and are a form of strength - training. Tennis is a racket sport mainly for hand - eye coordination and cardiovascular fitness. Hopscotch is a children's game for balance and coordination. Jump roping is a cardiovascular exercise.

Answer:

sit - ups